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April 22, 1947. Q T, T|NDE| JR 2,419,379

MAGAZINE sTovE Filed Nov. 25, 1942 4 sheets-Sheet 1 l lll/,4 Vfl.

o. T. vTINDELL, JR 2,419,379

MAGAZINE STOVE April 22, 1947. l

Filed Nov. 25, 1942 4`Sheets-Sheeft 2 April 22, 1947'.

o. T. TINDELL., JR I 2,419,379

MAGAZINE STOVE Filed Nov. 25,` 1942 4 sheets-sheet s' April 22. 194? o. T. TINDELI., JR 2,419,379

MAGAZINE STOVE Filed Nov. 25, 1942 4 Sheets-Sheet 4 www,

Patented pr. 22%, i7

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MAGE STVE s cisnes. (ci. icc-73) 'lhis invention is a domestic heating stove, for burning coal particularly; wood or other fuels, could of course, be used.

The stove is of the type having 9, fire pot form-. ing a fuel magazine of good size, and the principal object of the invention is to provide a stove which by reason of adequate feed of primary and particularly of secondary air, will make a hot fire fairly quickly, and which, particularly byreaI son of the feed of secondary air into the re pot, 1o will burn coal that in some stoves is dimcult to burn, namely, certain types of bituminous coal and coal containing rock, slate and bona According to this invention, the fire pot, which y is preferably made of tire brick, although it could be made of cast iron, is provided with vertical slots or passages for secondary air. The fire pot is supported on an apertured ring, the vertical passages being in registry with corresponding apertures in the supporting ring, so that secondary air can pass through the apertures in the ring into these vertical slots or passages, thereby becoming preheated, and thence into the re, aiding combustion and aiding in the burning up and consumption of smoke.

'I'he re pot may also be provided with another feed for secondary air,4 by providing the' re brick with lateral holes or passages therethrough, and by spacing the fire brick inwardly of the metallic casing so that there is a space back of the fire brick lining. Secondary air is supplied to these spaces behind the fire brick lining, becomes preheated, and then passes inwardly through the lateral passageways into the iire; also aiding combustion and serving to help consume the smoke.

One of the important features of the invention is that the apertured ring, supporting the fire brick lining, is in turn supported by a number of hollow brackets which are open at the top and bottom and so provide an independent supply of 4.0

secondary-air to the space behind the fire brick .-irom whence this secondary air, which by this 2 Fig. 2 is a section on the line'2n2 of Fig. l; Fig. 3 is a section on the line 3 3 of Fig. l;

Fig. 4 is a horizontal fragmentary section through one of the supporting legs; Fig. 5 is a perspective view of a portion of the dre brick lining;

Fig. 6 is a sectional view of a modilication,

showing an air inlet baiein the top oi the stove;

Fig. 7 is a fragmentary elevation o n line i-l of Fig. 6; and

Fig. 8 is a fragmentary section on line @-3 of Fig. 6.

Referring now to these drawings, the stove comprises a base plate 2 which supports a cylindrical sheet metal body portion d and is in turn supported by a base member 6 and legs 8. The base plate 2 forms the bottom of an ash pit i, access to which is had through a conventional door i2 provided with the usual damper Il. Supported by the base plate 2 is a number of hollow supporting brackets IB, which are substantially U- shaped in cross section, as shown particularly in Fig. 3, and which are held in place by bolts i8, passing through the legs 8. As shown particularly 'in Fig. 1, the hollow brackets i6 register with air inlet apertures 2@ in the base plate and provide channels or ducts fbr forming an independent supply ofsecondary air, to be described later.

The brackets it in turn support an apertured ring 22 which is a skeleton type of ring in that it is provided with a series of long and short apertures 22a and 22h, all the way around the ring. The ring 22, in addition to supporting a conven tional grate consisting of a ring il@ and grate bars 2t, also supports a fire pot, indicated generally at 28, and consisting preferably of fire bricks 3@ provided with grooves 32 along their vertical edges and with offset shoulders or ribs 3d, assembled to form a circular fire pot open at the top and bottom.

Referring particularly to Fig. 5, adjacent grooves 32 cooperate to form vertical passages t@ for secondary air, extending around the fire pot. The iire bricks areplaced on the supporting ring 22 so that the vertical passages 3e register with one oi the large apertures 22a, whereby secondary air passes upwardly through the slots 22a, thereby becoming preheated, and thence upwardly in the passages 3S and into the re.

The external ribs @t serve to space the re brick inwardly from the body t, thereby providing vertical air spaces or channels 38 back of the fire pot, for. secondary air, secondary air be.. ing supplied to these air channels by the hollow 3 air feeding brackets IB, already described. Some secondary air passes into these spaces from the ash pit l0. This secondary air becomes preheated and passes inwardly from the spaces 3-8 i6. However, such holes are optional and may* be omitted if desired.

Mounted on the upper, inner edge of the fire -pot 38 is a supporting ring 4d, the outer edges of which may be spaced inwardly from the top element 4B or the stove to allow some of the secondary air from spaces 38 to pass into the space 48 in the top of the stove. The stove is completed by a conventional top member 5U, feed door 52, smoke pipe El, and damper 53.

In operation, primary air passes upwardly through the grate 2t, 28 as usual. Secondary air passes upwardly through apertures 22a into the vertical passages 3B and thence into the lire pot. Additional secondary air passes up through the hollow brackets into the space back of the fire pot and thence through holes into the re pot. Some of this secondary 'air may pass around the outer edge of ring 45, into the space above the fire'pot.

All of the secondary air, by the time it reaches the fire, is well preheated, thereby aiding combustion and smoke consumption. The supply oi' preheated secondary air also enables the stove to make a quick pick-up after the drafts are opened after it has been banked.

By opening the drafts, the stove of the present invention has been found capable `.lot only of burning ordinary coal, but also of burning coals which are more difficult of combustion, such as certain types of bituminous coal and coals containing rock, slate and bone However, by

7 throwing down the drafts, a, slow fire may be maintained for a long time. By nlling the nre pot with coal, and shutting the drafts, the stove may be banked for long periods.

The stove of the present invention has been subjected to impartial competitive tests at the Bureau of Standards. In these tests, the fire was kindled with wood and coal and burned for a half hour. Then the fire pot was -fully charged with coal. With the drafts open, the lire broke through at the top of the fire pot 2 hours and 20 minutes later. Burning was continued, and a stack temperature csf-900 F. was reached 2 hours delivery opening 62, in any desired shape, which delivers additional air for aiding combustion of unburnt gases in the top of the stove. Member 56 also baiiles the heat, 'preventing too4 rapid escape of the hot gases up the stack, and tends to hold the heat in the top of the stove and to lower the stack temperature. By controlling the fire box damper I4, and the top dempers 53 and 60, the primary and secondary air may be varied over a wide range, with a corresponding range in the combustion rate of the stove. The baille member 56 is subjected to radiant heat from the tire pot and to heat from the hot gases passing up the stack, and so air entering through member 56 is well preheated when it enters the top of the stove. preheated secondary air adv mitted through the member 56 cooperates with preheated secondary air that' passes over the outer edge of the ring 44, in completing the combustion of any unburnt gases in the top of the stove;

'While the stove of the present invention has been described in considerable detail. it should be understood that the invention is not limited to the precise details shown, but may be carried out in other ways.

- I claim as my4 invention:

l. A domestic heating stove, comprisinga metallic body, an apertured supporting ringin the lower part of the body, a grate through which the primary air may pass, supported by said ring, e, iire brick lining supported by said ring, said lining having vertical slots opening on the inside of said nre brick lining for directing secondary air into the fire pot, registering with corresponding apertures in the supporting ring, said re brick lining being also provided with lateral passages through which secondary air may pass and with ribs for spacing the lining inwardly of the metallic body to denne vertical channels for seoondary air and hollow brackets, open at the top and bottom for supporting said apertured ring and for directing secondary air to said vertical channels, from whence it may pass inwardly through said lateral passages into the lire pot.

2. A domestic heating stove, comprising a metallic body, an aperturedsupporting ring in the lower part of the body, a grate through which the primary air may pass, supported by said ring, a re brick lining supported by said ring, said lining comprising nre bricks having lateral passages therein said iire bricks being grooved and shouldered to define vertical air passages on the inside of the fire pot and to deiine vertical ribs on the outside of the nre pot, said ribs serving to space Y, the ilre brick inwardly of the metallic body, to y. form vertical channels for second-,ary air Just outand 5 minutes after the Ybreak through. These Figs. 6, '7 and 8 show a modincation which may, if desired, be used in connection with the features already described. Referring tc these ngures, parts corresponding to the parts in Figs.

side said nre brick lining, the vertical passages in the fire brick lining registering with corresponding apertures in the supporting ring, said vertical passages being adapted to receive secondary air and to direct it into the fire pot, and hollow brackets, ope'n at the top'and bottom, for sup- 1-5 are correspondingly numbered. The air inlet heat baille of this modification comprises aV flattened tubular member 56, open at both ends, the rear end being in registry with an air inlet opening 58 in the back of the stove, which opening is controlled by a conventional damper 60. The front end of the member 56 forms an air porting said ring and for directing secondary air to said vertical channels, from whence it may pass inwardly through said lateral passages intov the nre pot.

3. A domestic heating stove, comprising in combination a metallic body. an apertured ring mounted in the lower part of said body, a re pot supported by said apertured ring, said nre pot being composed of fire bricks provided with means deiining inner vertical grooves and outer vertical ribs, said grooves denning air supplying passages on the inside of the nre pot communicating with the apertures in the apertured ring for receiving air therefrom, and directing such air into the re pot, said ribs serving to space the iire bricks inwardly from the metallic body to define vertical channels for secondary air between the bricks and the metallic body, hollow brackets for supporting said apertured ring and for directing secondary air to said vertical secondary air channels, and means for directing secondary air from said vertical channels into the fire pot.

4. domestic heating stove, comprising in combination a metallic body, an 'apertured ring mounted in the lower part of said body, a fire pot supported by said apertured ring, said fire pot Abeing composed of nre bricks provided with means dening inner vertical grooves and outer vertical ribs, said grooves defining air supplying passages on the inside of the re communicating with the apertures in the apertured ring for receiving. air therefrom, and directing such airv into the nre pcg said ribs serving to space the re bricks inwardly from the metallic body to define vertical ch: nnels for secondary air between the bricks and the metallic body, hollow brackets for supporting said apertured ring and for directing secondary air to said vertical secondary air channels, and means for directing secondary air from said vertical channels into the space above the nre pot.

5. A domestic heating stove, comprising a metallic body, an apertured ring in the lower. part of the body, a nre pot supported on said ring and provided with vertical grooves on the inside thereof and with passages therethrough through which 6 secondary air may pass, means for spacing the re pot inwardly of the metallic body to define an air space therebetween, which communicates with said passages through the nre pot, the vertical grooves on the inside of the pot register-lng with the apertures in the ring and being adapted to receive secondary air therefrom and to direct it into the nre, and hollow brackets, open at the top and bottom, for supporting said ring, and for directing secondary air to said air space, from whence it may pass through said passages in the fire pot and thence into the nre.

LIVER 'ri TINDELL, Jn.

REFERENCES CITED The following references are of record in the le o f this patent:

UNITED STATES PATENTS German Oct. 2l, 189'( 

